Gravatar is a service for providing globally unique avatars and was created by Tom Preston-Werner. It is owned by Automattic, having integrated it into their WordPress.com blogging platform.
PHP: Hypertext Preprocessor is a server-side scripting language designed for Web development, but also used as a general-purpose programming language. PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management systems, and web frameworks.
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SendinBlue users love its simple and powerful tools for managing email marketing campaigns, automation, transactional emails and SMS messaging. The best value in email marketing.
Sarbacane is a complete email marketing & newsletter solution for creating, sending & analyzing campaigns, with a graphic editor for designing newsletters.